Medical researchers do not know exactly what causes a brain AVM (arteriovenous malformation) to develop, but "there are a lot of theories," said Dr. Alexander Drofa, an endovascular neurosurgeon who ...

For much of the early part of 2022, Greta Tucker, then 14, experienced terrible headaches. “It was really impacting school and especially sports,” the now 15-year-old from Billerica, Massachusetts, ...

A strange headache, a blur in vision, a moment of confusion, these can easily pass off as stress or general fatigue. But sometimes, they can hint at something more, something hidden in the blood ...